ofxNetwork - Check for aborted connections on windows

On windows when a client doesn't disconnect cleanly winsock throws the WSAECONNABORTED error. This provides another way to determine if the connection is gone. This causes a lot of headaches when working with ofxMostPixelsEver.
ofxNetwork - read receive timeout from m_dwTimeoutReceive not m_dwTimeoutSend
refactored updates to network disconnection detection
Merge pull request #2628 from igierard/master

ofxNetwork - small bug fixes with ofxNetwork
Merge remote-tracking branch 'upstream/master' into Grahams-laptop-working-copy